Eosentomon morei Nakamura, 2010

Nakamura, Osami, 2010, Taxonomic revision of the family Eosentomidae (Hexapoda: Protura) from Japan 2701, Zootaxa 2701, pp. 1-109 : 76-78

Eosentomon morei Nakamura sp. nov.

Fig. 44; Table 18

Type specimens. Holotype female ( NSMT –Ap 510), Mt. Komaga –take, Kanegasaki –machi, Iwate Prefecture, 39º11'21"N, 140º55'41"E, 820 m elevation, litter of a forest dominated by F. crenata , 18-VIII-2001, H. Tamura et al. leg . Paratype: one female ( NSMT –Ap 511), same data as for the holotype .

Other specimens examined. One female, Ogamido, Shimokimita, Takahagi–shi, Ibaraki Prefecture, 36º48'33"N, 140º35'20"E, 540 m elevation, litter of a deciduous broad-leaved forest, 3- VII- 1988, H. Tamura et al. leg.; 1 female, Miyanozawa, Kamikimita, Takahagi–shi, Ibaraki Prefecture, 36º47'49"N, 140º34'38"E, 500 m elevation, litter of a forest dominated by F. crenata and Q. crispula , 26-VI-1989, K. Ishii & H. Sakayori leg.; 1 female, Kameyachi, Sekimoto–cho, Kitaibaraki–shi, Ibaraki Prefecture, 36º54'01"N, 140°37'08"E, 780 m elevation, litter of a forest dominated by Q. serrata and Q. crispula , 15-VI-2001, H. Sakayori et al. leg.

Description. Body length 592 (598) µm. Head 86 (87) µm long, 60 (52) µm wide. Setae pa and m4 present, but seta aa absent ( Fig. 44A), sensilla as and ps present; seta sp 1.2 times longer than p; sensilla pp rudimentary. Labral setae absent ( Fig. 44B). Seta rs simple, slightly longer than sr ( Fig. 44B). On maxillary palpus ( Fig. 44C) sensillum md slightly longer than ml. Digits on galea small and similar to each other ( Fig. 44D). Mandible with two teeth ( Fig. 44E). Clypeal apodemes distinct ( Figs. 44A, B). Pseudoculus 8 µm long, without inner structure ( Fig. 44F), PR = 11.

Foretarsus length ( Figs. 44G, H) 58 (58) µm; claw 14 (13) µm, TR = 4.2 (4.4); empodium 15 µm, EU = 1.0; sensillum s longer than claw, 16 (14) µm. Sensillum t1 nearer to α 3 than to α 3’, BS = 0.8 (0.8); t2 thinly spatulate; t3 surpassing base of α 7; a reaching nearly to base of γ 2; b reaching base of β 6; c linear; d not reaching base of α 5; e and g spatulate and long; f1 thinly spatulate; f2 thin; a' at same level with α 3; b'1 absent; b'2 as long as d; c' not reaching base of δ 6. Length of middle tarsus 28 (28) µm, length of claw 10 (9) µm; hind tarsus 36 (36) µm, claw 11 (10) µm; empodia of both tarsi short and less than 1/6 of claw length, 1 (1) µm long; on hind tarsus ( Fig. 44I) D2 seta-like; D4 spine-like.

Tracheal camerae slender ( Fig. 44J). Central lobe sinuate, inner lines incised ( Fig. 44K). Laterostigmata II–IV large, with no inner structure; those on V–VI small. On female squama genitalis ( Fig. 44L) processus sternalis serpentiform as a winding rope, caput processus smoothly curved towards a median of stylus, filum processus short. Male unknown.

Chaetotaxy as in Table 18. On thoracic tergites II–III, P1a and P2a seta-like; P1a posterior to P1–P2, at halfway between P1 and P2 or slightly nearer to P2 than to P1. P1a on abdominal tergite I, P1a and P2a on II–VI and P2a on VII filiform and longer than P1; P1a on VII sensillum-like and less than one-third length of P1, 5 µm long, posterior to P1–P2 ( Fig. 44M); on tergite VIII ( Fig. 44N) P1a’ without basal dilatation and anterior to P2, P2a linear.

Diagnosis. The present species resembles E. topochi Imadaté from Japan ( Imadaté, 1964a, 1974b, 1995) in the body chaetotaxy and the position of foretarsal sensilla, but it is distinguished from the latter in the absence of labral setae (present in E. topochi ), and on the forestarsus, sensillum a not reaching the base of γ 2 (surpassing the base of γ 2 in E. topochi ), t3 longer than c’ (shorter than c' in E. topochi ), and t2 and f1 spatulate (linear in E. topochi ).

In the key of Yin (1999) this new species tends to run to E. yilingense Yin & Zhang from China ( Yin, 1999; Yin & Zhang, 1982), but differs by the absence of labral setae (present in E. yilingense ), the position of P1a posterior to P1–P2 on the abdominal tergite VII (at same level with P1–P 2 in E. yilingense ) and the short empodium of the hind tarsus (long in E. yilingense ).

Etymology. The specific name is named in honor of "More", who was a clever sub-leader of the tribe Emishi , which occupied the area called Hitakami 1200 years ago, which includes the type locality of the present new species.

Distribution. Japan (Honshu).